What are lignins ........

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What are lignins?

They are complex polymers present in cell walls of the plants.

They are organic compounds responsible for high calorific value of biofuels.

They are building blocks of ligaments that join muscle to bone in organisms.

None of the above.

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Explanation:

1st option is correct.
Lignin is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants and some algae. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily.